This applies to POS with wedge scanners, not OPOS. The dialogue that appears when a barcode is not found during scanning is not visible enough. "The product associated with the bar code was not found. Please search for the product from the product search page." This occupies only a small fragment of the screen, like all other dialogues. This is a problem because, if you don’t keep our eyes on the screen at all time you can scan a lot of items before you are aware of the situation, that one or more barcodes was not recognized. If the dialogue filled the screen, and even better, in a bright colour, it would be easier to detect. Even better if an error sound could be played.